#include <iostream>

#include "head.hpp"
// #include "main.cpp"

using namespace std;

int Base::get_c() { return c; }
void display_a(Derived &d) {
    cout << "a: " << d.a << endl;
}
void Derived::fun() {
    cout << "a: " << a << endl;
    cout << "b: " << b << endl;
    cout << "c: " << get_c() << endl;
}